Jev for Apple Foundation Models
Swift bridge that turns Apple Foundation Models @Generable schemas into Jev typed questions and reconstructs typed results.
Added to Jevfast
How it uses Jev
The Swift bridge converts an Apple @Generable output schema into Jev questions and reconstructs a typed result. The sample nutrition-label app asks whether a product is safe, scores allergen risk and processing tier, and chooses a primary dietary flag.
What Jev decides
Nutrition-label dietary safetyExample answers · not a recorded Jev response · Source ↗
Question 1 · isSafe
YOUR APP
INSTRUCTION
Is the product fully compliant with the dietary restriction profile?
STATE
The nutrition scanner passes the product label and the user’s dietary restriction profile as the judgment context. Actual label values vary by scan.
JEV · NOUL
YesNo
Question 2 · allergenRisk
YOUR APP
INSTRUCTION
Rate allergen and cross-contamination risk.
STATE
The nutrition scanner passes the product label and the user’s dietary restriction profile as the judgment context. Actual label values vary by scan.
JEV · SCORE
0
Question 3 · processingTier
YOUR APP
INSTRUCTION
Classify NOVA processing tier.
STATE
The nutrition scanner passes the product label and the user’s dietary restriction profile as the judgment context. Actual label values vary by scan.
JEV · SCORE
0
Question 4 · primaryFlag
YOUR APP
INSTRUCTION
Choose the primary dietary conflict or nutritional warning.
STATE
The nutrition scanner passes the product label and the user’s dietary restriction profile as the judgment context. Actual label values vary by scan.
JEV · CHOICE
- none
- hiddenGluten
- dairyOrLactose
- seedOils
- highAddedSugar
- artificialSweeteners
- excessiveSodium
- animalDerivatives
App workflow
- Build a typed schema
The app declares a DietarySafetyDecision @Generable type with Boolean, bounded integers, and a DietaryFlag enum.
- Translate and ask Jev
The bridge maps constrained schema properties to Noul, Score, and Choice questions and sends the product context.
- Reconstruct the result
The bridge decodes Jev answers back into the Swift typed decision for the nutrition scanner.
Why it is interesting
The bridge makes Jev usable behind Apple Foundation Models’ typed schema interface, while rejecting unbounded strings and carrying schema constraints into the Jev request.